WO2014124199A1 - Buse pour dispositif de ramonage à élimination de condensat - Google Patents

Buse pour dispositif de ramonage à élimination de condensat Download PDF

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Publication number
WO2014124199A1
WO2014124199A1 PCT/US2014/015209 US2014015209W WO2014124199A1 WO 2014124199 A1 WO2014124199 A1 WO 2014124199A1 US 2014015209 W US2014015209 W US 2014015209W WO 2014124199 A1 WO2014124199 A1 WO 2014124199A1
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WO
WIPO (PCT)
Prior art keywords
nozzle
nozzle block
accordance
flow
midplane
Prior art date
Application number
PCT/US2014/015209
Other languages
English (en)
Other versions
WO2014124199A8 (fr
Inventor
Matthew R. HARKLEROAD
Steven R. Fortner
Tony F. Habib
Clinton A. Brown
Original Assignee
Diamond Power Internaitoanal, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Diamond Power Internaitoanal, Inc. filed Critical Diamond Power Internaitoanal, Inc.
Publication of WO2014124199A1 publication Critical patent/WO2014124199A1/fr
Publication of WO2014124199A8 publication Critical patent/WO2014124199A8/fr
Priority to US14/820,150 priority Critical patent/US10018431B2/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G15/00—Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/04—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape in flat form, e.g. fan-like, sheet-like
    • B05B1/044—Slits, i.e. narrow openings defined by two straight and parallel lips; Elongated outlets for producing very wide discharges, e.g. fluid curtains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
    • B05B1/3402—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to avoid or to reduce turbulencies, e.g. comprising fluid flow straightening means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/60—Arrangements for mounting, supporting or holding spraying apparatus
    • B05B15/62—Arrangements for supporting spraying apparatus, e.g. suction cups
    • B05B15/628—Arrangements for supporting spraying apparatus, e.g. suction cups of variable length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B1/00—Cleaning by methods involving the use of tools
    • B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
    • B08B1/16—Rigid blades, e.g. scrapers; Flexible blades, e.g. wipers
    • B08B1/165—Scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B08B3/024—Cleaning by means of spray elements moving over the surface to be cleaned
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/54—De-sludging or blow-down devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
    • F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
    • F23J3/023—Cleaning furnace tubes; Cleaning flues or chimneys cleaning the fireside of watertubes in boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G1/00—Non-rotary, e.g. reciprocated, appliances
    • F28G1/16—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
    • F28G1/166—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris from external surfaces of heat exchange conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G15/00—Details
    • F28G15/04—Feeding and driving arrangements, e.g. power operation

Definitions

  • This invention is related to a cleaning device for combustion devices and particularly to one for large scale combustion devices for the reduction of soot and/or slag encrustations forming on internal heat exchange surfaces.
  • sootblowers are used today.
  • One type of sootblower is positioned permanently inside a boiler and is actuated periodically to eject a sootblowing medium.
  • Other types are retractable and include the so-called long retracting sootblowers having a long lance tube which is periodically advanced into and retracted from the heat exchanger.
  • the lance tube features one or more nozzles at its distal end from which the cleaning medium is ejected.
  • the retraction feature of these sootblowers enables the lance tube to be removed from the intense heat within the combustion device between the cleaning cycles which would otherwise damage the lance tube.
  • sootblowers In most applications of long retracting sootblowers the lance tube is simultaneously rotated as it is axially extended into and out of the boiler so that the stream of sootblowing medium traces a helical or oscillating path during the cleaning cycle. Sootblowers are normally operated intermittently in accordance with a schedule which considers cleaning requirements, sootblower medium consumption, boiler thermal efficiency, and various other factors.
  • sootblower configurations which seek to avoid the disadvantages associated with ejection of condensate when using steam as the cleaning medium.
  • An example of such designs is provided with reference to applicant's previously issued U.S. Patent Nos. 5,063,632.
  • Sootblower nozzles are designed to provide efficient conversion of the static and dynamic pressure of the supplied sootblowing medium into a stream ejected from the cleaning nozzle(s) which has a high cleaning effect or peak impact pressure.
  • Fluid flow interference caused by a disrupted cleaning medium flow at the nozzle entrance may lead to performance degradation.
  • Further disadvantages of known sootblower nozzle blocks for condensate ejection include the requirement of complex internal welded components which can become dislodged or deteriorate during use.
  • One known technique for reducing condensate ejected from the cleaning nozzles is to use a port at the distal end of the lance tube provided to allow the ejection of condensate at the terminal end along the longitudinal axis of the sootblower nozzle block.
  • This approach described in the previously referenced US patent, creates a continuously open flow path initially for condensate ejection but thereafter permits cleaning medium to escape. Since cleaning medium ejected along the lance tube longitudinal axis is, in most applications, not useful for providing a cleaning effect, this discharge flow constitutes an efficiency degradation of the sootblower's operating performance.
  • An ejection port at the nozzle block distal end produces a spray of condensate into the boiler internal volume.
  • a port for condensate ejection acts as an "inefficient" nozzle, in terms of generating a coherent high velocity stream of condensate at a given supply pressure.
  • the condensate spray pattern ejected from a condensate port would be highly dispersed with low impact pressure characteristics.
  • sootblowing applications it is desirable to preserve the supplied sootblowing medium's dynamic and static pressure as it is converted to a stream of cleaning medium emitted from the lance tube nozzles which provides a high dynamic cleaning effect. Accordingly, it is desirable to provide a nozzle block which provides the previously noted desirable features while maintaining excellent performance in terms of cleaning effect.
  • This invention is related to a sootblower system incorporating a novel lance tube nozzle block having features for reducing the quantity of condensate ejected from cleaning nozzles forming on the inside of the nozzle block, lance tube, poppet valve, and related plumbing passageways or entrained in the cleaning medium supply in a manner which does not lead to boiler tube erosion.
  • the sootblower cleaning nozzles which are aimed at the heat transfer surfaces to be cleaned, spray a steam or a steam/air mixture relatively free of condensate.
  • this invention is capable of substantially minimizing the erosive effect caused by an initial output of a slug of condensate, or condensate present in a steady-state condition against heat transfer surfaces in a boiler.
  • the nozzle block in accordance with this invention provides a condensate separation feature and further a means for ejecting the condensate from the nozzle block in a manner which, for intended applications, does not cause boiler tube erosion.
  • the condensate separating effect provided by the nozzle block in accordance with this invention allows the use of saturated steam or a steam/water mixture for the purposes of cooling the lance tube, while avoiding the degree of heat exchanger erosion which would occur if all the condensed or entrained liquid water were sprayed against the heat exchanger surfaces from cleaning nozzles.
  • the nozzle block in accordance with an embodiment of this invention is preferably formed as an integral casting and forms two separated flow paths for the cleaning medium.
  • the flow is separated at about the diametric mid-plane of the lance tube inside diameter by a divider wall to define two separated flow paths dedicated to separate nozzles.
  • Each of the flow paths travels to the terminal end of a nozzle block where it undergoes a sharp "U-turn" bend (i.e. about 180°) and then extends rearward and terminates at a sootblower nozzle for spraying the cleaning medium radially from the nozzle block.
  • the two separated flow paths are intertwined within the nozzle block interior.
  • the terminal end of the nozzle block features a pair of elongated slot passageways which serve to provide an ejection port for condensate.
  • a slot is provided for each of the flow paths and has a particular orientation with respect to the cleaning medium flow to enhance the condensate separation effect. While the slot provides an effective condensate separation effect, it's cross-sectional flow area remains small, resulting in a low percentage of cleaning medium passing through the slots not available for cleaning purposes.
  • the previously mentioned flow path orientations are provided with the condensate ejection slots.
  • the interior nozzle flow paths have the features for guiding condensate adhering to the internal surfaces of the nozzle block passageways toward and out of the condensate ejection slots.
  • a still further embodiment provides condensate ejection for a single distal end nozzle for a nozzle block which does not divide the flow paths between a pair of nozzles, or with features only a single distal end nozzle.
  • Figure 1 is pictorial view of a long retracting sootblower which is an example of one type of sootblower with which the present invention may be employed;
  • Figure 2 is a pictorial view of a conventional long retracting sootblower showing condensate being ejected against a pendant section of boiler tubes in a boiler;
  • Figure 3 is a pictorial view of a nozzle block in accordance with the present invention.
  • Figure 4 is an end view of the nozzle block shown in Figure 3;
  • Figure 5 is a side view of the nozzle block shown in Figure 3 shown ejecting steam and condensate;
  • Figure 6 is a pictorial view of the nozzle block in accordance with this invention showing internal surfaces in phantom lines;
  • Figures 7A, 7B, and 7C are alternate pictorial views of the nozzle block inside cavities forming the nozzle passageways shown as cores used to form the inside cavities;
  • Figure 8 is a side view of a nozzle block showing additional features of the invention.
  • Figure 9 is a cross-sectional view through the nozzle block
  • Figure 10 is a partial cross-sectional view taken along line 10-10 from Figure
  • Figure 1 1A is a cross-sectional view taken along line 1 1A-1 1 A from Figure 10;
  • Figure 1 1 B is a cross-sectional view taken along line 1 1 B-1 1 B from Figure 13;
  • Figure 12 is a cross-sectional view through a nozzle block in accordance with this invention.
  • Figure 13 is another cross-sectional view through a nozzle block in accordance with this invention.
  • Figure 14A is a pictorial view showing partially in longitudinal section of the nozzle block in accordance with a second embodiment of this invention having a condensate ejection port;
  • Figure 14B is a cross-sectional view of the nozzle block shown in Figure 14A.
  • Figure 1 illustrates a long retracting type sootblower which is an example of one type which can be employed with the nozzle block in accordance with present invention.
  • the sootblower as shown in Figure 1 is generally designated by reference number 10 and has a construction as disclosed by U.S. Pat. No. 3,439,376 granted to J.E. Nelson et al on Apr. 22, 1969, which is hereby incorporated by reference.
  • Sootblower 10 principally comprises frame assembly 12, lance tube 14, feed tube 16, and carriage 18. Sootblower 10 is attached to an associated boiler by mounting front bracket 19 to boiler side wall 28 (shown in Figure 2).
  • Figure 1 shows sootblower 10 in its normal resting position.
  • lance tube 14 Upon actuation, lance tube 14 is extended into and retracted from the boiler interior and is typically simultaneously rotated (either through full rotations as in a helix or in an oscillating motion).
  • a sootblowing cleaning medium such as air, steam, or water, or a mixture of these fluids (or some other material) is supplied to poppet valve 20 and fed through feed tube 16 which is held stationary.
  • a fluid seal (not shown) is provided between tubes 14 and 16 to enable the sootblowing medium to be ejected from one or more cleaning nozzles 22.
  • This invention is associated with the use of steam or a steam/air mixture as the cleaning medium, or another cleaning medium in which condensate or entrained liquids may be present.
  • sootblowing system of a conventional configuration is shown as background for presenting the advantages provided by the present invention.
  • lance tube 14 is shown protruding through the side wall 28 of the heat exchanger which is covered by an array of heat transfer wall tubes 30.
  • sootblower 10 is provided for cleaning a pendant (i.e. hanging) section of boiler tubes 32.
  • Another row of pendant tubes 32 would typically be provided laterally opposite the section shown but is not shown for the sake of clear illustration.
  • sootblower nozzle 22 may also be oriented to clean other surfaces within a heat exchanger, such as back against wall tubes 30.
  • a nozzle block 24 in accordance with a first embodiment of the present invention is illustrated in Figures 3 through 6 and is formed from a body or housing 36.
  • body 36 is formed by a casting process as will be described in further detail in the following description.
  • Nozzle block 24 forms proximal end 38 which is affixed to a hollow lance tube 14 such as by welding.
  • Distal end 40 is the terminal end of the lance tube assembly.
  • Body 36 forms two internal cleaning medium passageways formed by internal wall surfaces referred to as first nozzle passageway 42 and second nozzle passageway 44. These passageways are separated by divider wall 46 extending along a diametric center plane 68 of nozzle block body 36.
  • both passageways 42 and 44 the cross-sectional flow area of the flow passageway decreases from the entrance at divider wall 46 and becomes necked down to form axial flow passageways 48 and 50, respectively, extending on opposite sides of the diametric center plane 68.
  • These passageways 42 and 44 are generally semi-circular (in cross section) cavities which extend from divider wall 46 toward distal end 40.
  • Both nozzle passageway 42 and 44 undertake a U-shaped turns (about 180°) 49 and 51 at distal end 40 crossing midplane 68 and transition to retrograde sections 52 and 54, respectively. These sections 52 and 54 then transition to 90° (approximate) elbow sections 56 and 58 and finally terminate at respective nozzle outlets 60 and 62, which are centered on midplane 68.
  • Figures 7A through 7C show the configuration of nozzle passageway 42
  • FIG. 44 by illustrating three-dimensional molding cores 102 and 104 which could be used for casting nozzle block body 36 and forming the internal wall surfaces of the nozzle block. Portions of the cores which form particular features are identified by the reference numbers used for those features with a "c" (for core) suffix (for example, core section 48c forms axial flow passageway 48, etc.). As shown in Figure 7A, passageway core sections 42c and 44c become intertwined with one another and second nozzle passageway core section 44c terminates at nozzle outlet core section 62c, which is farther from distal end 40 than is nozzle outlet core section 60c.
  • the cross-sectional configuration of the passageway at nozzle outlets 60 and 62 can feature various configurations well known in compressible flow nozzle theory, such as the Laval-type nozzle featuring a converging/diverging wall having a restricted throat cross-sectional area and an enlarging cross-sectional area going from the throat to the discharge nozzle outlet core sections 60c and 62c.
  • first axial passageway 48 extends along one side of midplane 68
  • U-turn 49 crosses the midplane
  • retrograde section 52 extends on the opposite side of the midplane.
  • Elbow section 56 forms nozzle outlet 60 which lies on midplane 68.
  • Axial flow passageway 50 has a similar relation to midplane 68, with nozzle outlet 62 also centered on midplane 68.
  • a significant features of nozzle block 24 is the provision of a pair of condensate ejection slots 64 and 66 extending along mid-lines 65 and 67 respectively, which open at nozzle block body distal end 40.
  • slots 64 and 66 are significantly narrower than their length (“L") and are oriented such that their narrow (width "W") dimension is parallel to the flow of cleaning medium as it undergoes U-turns 49 and 51 (the length L dimension is perpendicular to the flow at the slots).
  • the advantages and features of slots 64 and 66 will be described in greater detail. Slots 64 and 66 form extending midlines 65 and 67, extending in their length ("L”) direction.
  • slots 64 and 66 have a constant width (W) along midlines 65 and 67.
  • the embodiments shown feature slots 64 and 66 formed by midlines 65 and 67 which are straight lines.
  • midlines 65 and 67 could be curved, for example in a letter "C" shape, or partially arcuate.
  • slot 64 and 66 are oriented such that mid-lines 65 and 67 are at or nearly perpendicular to the flow of fluid passing through nozzle passageway 42 and 44 at U-turns
  • the ejection slots 64 and 66 are not round and have a greater length (L) than width (W) and are oriented such that the width (W) dimension is aligned with the flow path of a cleaning medium as it flows through elbow sections 56 and 58
  • nozzle internal flow passageways 42 and 46 provide a number of significant features from a fluid flow perspective. By separating the flow into two paths and isolating them, the effects of interference and turbulence caused by their interaction is eliminated.
  • the retrograde folded-back configuration of the passageways provides a long flow path for the fluid flow to become more laminar, thus reducing high degrees of turbulence which degrades nozzle efficiency.
  • nozzle block body 36 By forming nozzle block body 36 as a one-piece casting, problems associated with loose internal components are avoided entirely.
  • the flow of the cleaning medium close to the entire outside surface of nozzle block body 36 from proximal end 38 to distal end 40 ensures that the nozzle block body is cooled by the flow cleaning medium. This avoids formation of highly heated areas of nozzle block 24 which can lead to deterioration.
  • slots 64 and 66 are important for their operation.
  • Slots 64 and 66 provide an ejection pathway for condensate which is entrained in the cleaning medium flow or forms on internal wall surfaces of the nozzle block body 36. Slots 64 and 66 are positioned at the outer portion of the internal wall surface of U-turns 49 and 51 (i.e. the outside part of the turns) where inertia of the more dense entrained particulates tend to cause them to flow toward the outer section of the passageway at the U-turns (or the action of the apparent centrifugal force) where it can be intercepted by the presence of slots 64 and 66. Thus entrained liquid in the cleaning medium flow becomes directed against the outer surface forming U-turns 49 and 51 where the condensate encounters slots 64 and 66.
  • the internal pressure of the cleaning medium within nozzle block body 36 causes the condensate flowing to slots 64 and 66 to be ejected from the slots.
  • the leakage of cleaning medium through slots 64 and 66 represents an incremental decrease in the efficiency of the cleaning effect provided by the nozzle block 24. This is the case since cleaning medium escaping slots 64 and 66 is not directed in a manner to provide desired cleaning of heat transfer surfaces.
  • the cross-sectional flow areas of slots 64 and 66 are intentionally minimized. In one embodiment of the present invention the cross- sectional flow area provided by slots 64 and 66 are about 15% of the cross-sectional area of the throats of their respective nozzle outlets 60 and 62.
  • Slots 64 and 66 can be made very thin in width (W) such that they produce a relatively small flow area.
  • slots 64 and 66 have a length dimension L and a width dimension W, wherein the length (L) is more than five times the width (W) providing a generally rectangular shape.
  • the length (L) of slots 64 and 66 is selected to ensure that they extend across the majority of the cross-sectional width of the flow passageway at U-turns 49 and 51 , increasing the condensate that is intercepted by the presence of the slots.
  • Other possible shapes such as slots 64 and 66 having a constant width formed along curved paths or other shapes could be provided.
  • the ejection slots 64 and 66 are not round and have a greater length (L) than width (W) and are oriented such that the width dimension is aligned with the flow path of a cleaning medium as it flows through U-turn sections 49 and 51.
  • Figure 5 illustrates operation of nozzle block 24.
  • steam is ejected from nozzle outlets 60 and 62.
  • Higher density condensate is shown being ejected from slots 64 and 66 in this figure (shown overlapping).
  • the nozzle blocks in accordance with this invention may not entirely eliminate condensate ejected from sootblower nozzle block cleaning nozzles. However, the substantial reduction in such undesirable condensate ejection is provided which may have a significant positive effect on boiler operation.
  • Nozzle block 24 in accordance with this invention has features which provide an additional mechanism for condensate separation and ejection beyond those previously described.
  • the principle of using a centrifugal force effect with higher density condensate is described. This is useful for handling condensate entrained within the cleaning medium flow or adhering to certain surfaces of the flow passageway. It is further the case that condensate tends to collect and flow along the inside wall surfaces of the flow passageways due to the lower fluid velocity encountered at the wall surfaces, a quenching effect provided by cooling of the cleaning medium at the wall surfaces, and a surface tension effect caused by the liquid contacting the wall surfaces. These factors can lead to a layer of condensate flowing along the internal nozzle wall surfaces.
  • Nozzle block 24 incorporates features designed to intercept condensate flowing along the nozzle passageway flow surfaces to direct it toward and out of slots 64 and 66.
  • FIGs 9 and 10 in particular illustrate the provision of water corral 80, which is a raised V-shaped (as seen in Fig. 10) wall 82 formed on the inside wall surface of axial flow passageways 48 and 50 just before U-turns 49 and 51 (inside refers to the surface near the inner radii of the turns).
  • Condensate adhering on the inside wall surface 76 encounters wall 82 and is diverted to flow toward another wall feature termed a wall scraper 84 in the form of a ledge or fin which directs the condensate toward the outside surface of the flow passageway and toward slots 64 and 66.
  • a pair of wall scrapers 84 are provided for each axial flow passageways 48 and 50, and begin at the edges 82 of water corral 80 from the inside surface of the nozzle passageway toward the outer surface at the edges of slots 64 and 66.
  • wall scrapers 84 are angled such that there is a component of flow velocity of the cleaning medium which tends to move the liquid along the wall scrapers toward slots 64 and 66.
  • wall scraper 84 is downstream as the cleaning medium flows as compared to its section at water corral edges 82. Condensate which is on the lateral surfaces of axial flow passageway 40 and 50 will be intercepted by wall scrapers 84. As mentioned previously, condensate which is on the outer surface of the axial flow passageways at U-turns 49 and 51 will be intercepted by slots 64 and 66.
  • slot 64 can be described as having a near edge 86 and a far edge 88.
  • Near edge 86 is the first edge that is encountered by condensate flowing toward slot 66.
  • far edge 88 extends further toward the midline of the passageway and thus presents an offset upstanding wall section 88 for the enhanced interception of condensate.
  • the offset of far edge 88 is 0.100 inch. It is expected that the effect distance is greater than 0.050 inch.
  • FIG. 14A and 14B A second embodiment of a nozzle in accordance with this invention is shown in Figures 14A and 14B and is generally designated by reference number 90.
  • Nozzle block 90 does not feature the reverse direction flow paths of the previously described embodiment and does not provide a separation between two nozzle flow paths. Instead, nozzle block 90 is a cast structure in which the inside cavity of the nozzle block 90 is restricted and causes the flow of cleaning medium to undertake an approximately 90° turn at distal end 94.
  • Nozzle block 90 uses some of the features provided by applicant's previously issued U.S. Patent No. 6,764,030 (which is hereby incorporated by reference) in that it provides a smooth flow passageway for the cleaning medium to increase nozzle cleaning efficiency.
  • Nozzle block 90 incorporates one principal feature of the present invention for the ejection of condensate; namely, slot 96.
  • Nozzle block 90 may feature a second nozzle outlet (not shown) positioned upstream of the distal end 94 for discharge of cleaning medium, preferably in a direction diametrically opposite the flow of medium from nozzle outlet 92.
  • Slot 96 is provided at the distal end at a region where the cleaning medium undergoes a high rate of change in direction and is provided at the outer surface 100 of that flow path turn.
  • the cleaning medium flowing toward the right- hand direction in the figure is caused to move downwardly and undergoes a rapid change in direction in the turn toward nozzle outlet 92.
  • the arrows in the figures show, based on the density of the dots and speckles in the drawing signifying that the higher density fluid condensate 108 collects along the bottom surface of the passageway where is directed toward an out of slot 96.
  • ejection slot 96 is provided as an ejection port for condensate.
  • slot 96 has a width (W) significantly less than its length (L) and the slot is cut in a manner such that its width dimension is parallel to the flow path of the cleaning medium. Accordingly, slot 96 operates in a manner of the prior embodiment in that condensate flow is interrupted by the presence of the slot and becomes ejected safely from the nozzle block. Moreover, the cross-sectional flow area of slot 96 is minimized to reduce efficiency loss in the operation of the nozzle block.
  • the length (L) of ejection slot 96 extends to approximately the diameter of the throat 1 14 (minimum diameter section) of nozzle outlet 92.
  • Slot 96 may have a cross-sectional area about 15% of that defined by throat 1 14 of nozzle outlets 92.
  • slot 96 may have the far wall 1 10 offset from near wall 1 12, for example by an amount of 0.100 inch. Such an offset is evident in the cross-sectional view Figure 14B.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Nozzles (AREA)
  • Incineration Of Waste (AREA)

Abstract

L'invention concerne un bloc de buses pour un dispositif de ramonage du type permettant le nettoyage de surfaces de transfert de chaleur internes de systèmes de combustion chauffés au charbon à grande échelle. Pour le nettoyage des surfaces internes, un milieu de nettoyage est souvent utilisé sous la forme de vapeur. En raison des opérations cycliques et du processus de condensation, des bouchons de condensat d'eau peuvent se former dans les éléments d'écoulement de fluide du dispositif de ramonage. Si ces bouchons sont éjectés contre des surfaces propres, une érosion indésirable peut se produire. Plusieurs modes de réalisation de blocs de buses sont décrits, chacun desdits modes de réalisation comprenant un ou plusieurs orifices d'éjection au niveau de ses extrémités distales afin de développer au maximum l'éjection de condensats tout en réduisant au minimum leur zone transversale, ce qui diminuerait l'efficacité fluidique des buses. Des éléments supplémentaires améliorent la capacité du bloc de buses à séparer et disperser le condensat des fentes.
PCT/US2014/015209 2013-02-08 2014-02-07 Buse pour dispositif de ramonage à élimination de condensat WO2014124199A1 (fr)

Priority Applications (1)

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US14/820,150 US10018431B2 (en) 2013-02-08 2015-08-06 Condensate removal sootblower nozzle

Applications Claiming Priority (2)

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US201361762613P 2013-02-08 2013-02-08
US61/762,613 2013-02-08

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US14/820,150 Continuation US10018431B2 (en) 2013-02-08 2015-08-06 Condensate removal sootblower nozzle

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WO2014124199A1 true WO2014124199A1 (fr) 2014-08-14
WO2014124199A8 WO2014124199A8 (fr) 2015-04-16

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CN105728382A (zh) * 2016-04-22 2016-07-06 苏州工业园区中法环境技术有限公司 格栅自动清洗装置

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DE102016006497A1 (de) * 2016-05-27 2017-11-30 Balcke-Dürr GmbH Luftvorwärmeinrichtung, insbesondere für eine Müllverbrennungsanlage, Müllverbrennungsanlage, Verfahren zum Reinigen einer Luftvorwärmeinrichtung sowie Verfahren zum Betrieb einer Müllverbrennungsanlage
US11408694B2 (en) * 2020-03-19 2022-08-09 Saudi Arabian Oil Company Reciprocating spray cleaning system for air-cooled heat exchangers
CN111870711A (zh) * 2020-08-07 2020-11-03 武汉新华中欣生物工程设备有限公司 一种脉动真空灭菌柜的蒸汽发生器

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WO2014124199A8 (fr) 2015-04-16
US20150345878A1 (en) 2015-12-03
US10018431B2 (en) 2018-07-10

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